Difficult to say. I also want to see the power requirements of the next gen AMD GPU to compare it to the RTX 4090. 

Things do need to start normalizing to a proper easy to manage temp\heat\power balance. As is, it's getting all the more difficult because Intel, AMD and Nvidia are all trying to one up each other and it's causing a huge mess for us the end users to deal with. Not to mention there are many places in America alone where houses have been and still are not built to be electrically stable. Heck here in Arizona many of the rented homes I've lived in have had various electrical issues.

The 4090 sustains over 600w out-of-the-box if the correct 12VHPWR power cable is used. I think it's safe to say the industry is going to stick with 500w as the new normal, and probably continue to push the envelope beyond that eventually. Intel's Raptor Lake chips are performant but they also draw twice the watts. A 13900K draws 200w more than a 10900K, even 120w more than a 12900K. And just as PCIe 4.0 SSDs draw more power than 3.0 versions, the 5.0 SSDs are only increasing the power consumption too. IO & bandwidth is not free.
 
I'd bet you we will see the 5000-series RTX cards featuring dual 12VHPWR connections.... not because they need >600w, but purely for safety reasons. After that happens given the decreasing rate & benefits from node shrinks it seems inevitable NVDIA will eventually put out a super massive GPU die that will probably need >600w as the flagship part before 2030.